There's a good reason why you couldn't find any thing about how to adjust it. The following is from the service manual.
"Self-Adjusting Clutch (SAC)Function
On ordinary clutches, the clutch pedal load increases as the clutch disc wears. The self-adjusting clutch is designed so the clutch pedal load will not increase even when the clutch disc wears. This is done by automatically adjusting the
fulcrum of the diaphragm spring in accordance with the wear of the clutch disc. The clutch pedal load stays consistant even when the clutch disc is worn."
There is a small mechanical adjustment you can make related to the clutch pedal height, but that didn't seem to be what you were asking about.